static unsigned int ConvertOpenCOLLADAMeshVertexDataToGLTFMeshAttributes(const COLLADAFW::MeshVertexData &vertexData, GLTF::IndexSetToMeshAttributeHashmap &meshAttributes)
{
// The following are OpenCOLLADA fmk issues preventing doing a totally generic processing of sources
//1. "set"(s) other than texCoord don't have valid input infos
//2. not the original id in the source
std::string name;
size_t length, elementsCount;
size_t stride = 0;
size_t size = 0;
size_t byteOffset = 0;
size_t inputLength = 0;
size_t setCount = vertexData.getNumInputInfos();
bool unpatchedOpenCOLLADA = (setCount == 0); // reliable heuristic to know if the input have not been set
if (unpatchedOpenCOLLADA)
setCount = 1;
for (size_t indexOfSet = 0 ; indexOfSet < setCount ; indexOfSet++) {
if (!unpatchedOpenCOLLADA) {
name = vertexData.getName(indexOfSet);
size = vertexData.getStride(indexOfSet);
inputLength = vertexData.getLength(indexOfSet);
} else {
// for unpatched version of OpenCOLLADA we need this work-around.
name = GLTF::GLTFUtils::generateIDForType("buffer").c_str();
size = 3; //only normal and positions should reach this code
inputLength = vertexData.getLength(0);
}
//name is the id
length = inputLength ? inputLength : vertexData.getValuesCount();
elementsCount = length / size;
unsigned char *sourceData = 0;
size_t sourceSize = 0;
GLTF::ComponentType componentType = GLTF::NOT_AN_ELEMENT_TYPE;
switch (vertexData.getType()) {
case COLLADAFW::MeshVertexData::DATA_TYPE_FLOAT: {
componentType = GLTF::FLOAT;
stride = sizeof(float) * size;
const COLLADAFW::FloatArray* array = vertexData.getFloatValues();
sourceData = (unsigned char*)array->getData() + byteOffset;
sourceSize = length * sizeof(float);
byteOffset += sourceSize; //Doh! - OpenCOLLADA store all sets contiguously in the same array
}
break;
case COLLADAFW::MeshVertexData::DATA_TYPE_DOUBLE: {
/*
sourceType = DOUBLE;
const DoubleArray& array = vertexData.getDoubleValues()[indexOfSet];
const size_t count = array.getCount();
sourceData = (void*)array.getData();
sourceSize = count * sizeof(double);
*/
// Warning if can't make "safe" conversion
}
break;
default:
case COLLADAFW::MeshVertexData::DATA_TYPE_UNKNOWN:
//FIXME report error
break;
}
// FIXME: the source could be shared, store / retrieve it here
shared_ptr <GLTFBufferView> cvtBufferView = createBufferViewWithAllocatedBuffer(name, sourceData, 0, sourceSize, false);
shared_ptr <GLTFMeshAttribute> cvtMeshAttribute(new GLTFMeshAttribute());
cvtMeshAttribute->setBufferView(cvtBufferView);
cvtMeshAttribute->setComponentsPerAttribute(size);
cvtMeshAttribute->setByteStride(stride);
cvtMeshAttribute->setComponentType(componentType);
cvtMeshAttribute->setCount(elementsCount);
meshAttributes[(unsigned int)indexOfSet] = cvtMeshAttribute;
}
return (unsigned int)setCount;
}
static unsigned int __ConvertOpenCOLLADAMeshVertexDataToGLTFAccessors(const COLLADAFW::MeshVertexData &vertexData,
GLTFMesh* mesh,
GLTF::Semantic semantic,
size_t allowedComponentsPerAttribute,
shared_ptr<GLTFProfile> profile)
{
// The following are OpenCOLLADA fmk issues preventing doing a totally generic processing of sources
//1. "set"(s) other than texCoord don't have valid input infos
//2. not the original id in the source
std::string id;
size_t length, elementsCount;
size_t stride = 0;
size_t componentsPerElement = 0;
size_t byteOffset = 0;
size_t inputLength = 0;
size_t setCount = vertexData.getNumInputInfos();
bool unpatchedOpenCOLLADA = (setCount == 0); // reliable heuristic to know if the input have not been set
if (unpatchedOpenCOLLADA)
setCount = 1;
for (size_t indexOfSet = 0 ; indexOfSet < setCount ; indexOfSet++) {
bool meshAttributeOwnsBuffer = false;
if (!unpatchedOpenCOLLADA) {
id = vertexData.getName(indexOfSet);
componentsPerElement = vertexData.getStride(indexOfSet);
inputLength = vertexData.getLength(indexOfSet);
} else {
// for unpatched version of OpenCOLLADA we need this work-around.
id = GLTF::GLTFUtils::generateIDForType("buffer").c_str();
componentsPerElement = 3; //only normal and positions should reach this code
inputLength = vertexData.getLength(0);
}
length = inputLength ? inputLength : vertexData.getValuesCount();
elementsCount = length / componentsPerElement;
unsigned char *sourceData = 0;
size_t sourceSize = 0;
GLTF::ComponentType componentType = GLTF::NOT_AN_ELEMENT_TYPE;
switch (vertexData.getType()) {
case COLLADAFW::MeshVertexData::DATA_TYPE_FLOAT: {
componentType = GLTF::FLOAT;
stride = sizeof(float) * componentsPerElement;
const COLLADAFW::FloatArray* array = vertexData.getFloatValues();
sourceData = (unsigned char*)array->getData() + byteOffset;
sourceSize = length * sizeof(float);
byteOffset += sourceSize; //Doh! - OpenCOLLADA store all sets contiguously in the same array
}
break;
case COLLADAFW::MeshVertexData::DATA_TYPE_DOUBLE: {
//FIXME: handle this
/*
sourceType = DOUBLE;
const DoubleArray& array = vertexData.getDoubleValues()[indexOfSet];
const size_t count = array.getCount();
sourceData = (void*)array.getData();
sourceSize = length * sizeof(double);
*/
// Warning if can't make "safe" conversion
}
break;
default:
case COLLADAFW::MeshVertexData::DATA_TYPE_UNKNOWN:
//FIXME report error
break;
}
//FIXME: this is assuming float
if (allowedComponentsPerAttribute != componentsPerElement) {
sourceSize = elementsCount * sizeof(float) * allowedComponentsPerAttribute;
float *adjustedSource = (float*)malloc(sourceSize);
float *originalSource = (float*)sourceData;
size_t adjustedStride = sizeof(float) * allowedComponentsPerAttribute;
if (allowedComponentsPerAttribute < componentsPerElement) {
for (size_t i = 0 ; i < elementsCount ; i++) {
for (size_t j= 0 ; j < allowedComponentsPerAttribute ; j++) {
adjustedSource[(i*allowedComponentsPerAttribute) + j] = originalSource[(i*componentsPerElement) + j];
}
}
} else {
//FIXME: unlikely but should be taken care of
}
//Free source before replacing it
if (meshAttributeOwnsBuffer) {
free(sourceData);
}
componentsPerElement = allowedComponentsPerAttribute;
meshAttributeOwnsBuffer = true;
sourceData = (unsigned char*)adjustedSource;
stride = adjustedStride;
}
// FIXME: the source could be shared, store / retrieve it here
shared_ptr <GLTFBufferView> cvtBufferView = createBufferViewWithAllocatedBuffer(id, sourceData, 0, sourceSize, meshAttributeOwnsBuffer);
shared_ptr <GLTFAccessor> cvtMeshAttribute(new GLTFAccessor(profile, profile->getGLTypeForComponentType(componentType, componentsPerElement)));
cvtMeshAttribute->setBufferView(cvtBufferView);
cvtMeshAttribute->setByteStride(stride);
cvtMeshAttribute->setCount(elementsCount);
mesh->setMeshAttribute(semantic, indexOfSet, cvtMeshAttribute);
}
return (unsigned int)setCount;
}